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L J D R O F W A R flu M TAPPING MACHINE.

Patented July v10, .1894.

' 5 UNITED STATES PATENT OF ICE. Y

MORGAN CRAWFORD, JR., OF STOOKTORCALIFORNIA, ASSIGNOR OF ONE HALF TOGEORGE J. THOMPSON, OF SAME PLACE.

TAPPlNG-MACHINE- SPECIFICATION forming part of Letters Patent No.522,654, dated July 10, 1894.

Application filedIebruary 5, 1894. Serial No. 499,160- (No model.) A

marked thereon, which form a part of this specification.

My lnvention relates to improvements in tappin g machines such as areused in tapping water, gas, steam and oil pipes while the same arounderpressure and it consists in the pew culiar construction, novelcombination and adaptatlon of parts hereinafter described andparticularly pointed out in the claim appended.

In the accompanying drawings: Figure 1 represents a side view of myimproved tapping machine in position to tap a pipe. Fig. 2 is asectional view of the same. Fig. 3 is a detached View of the attachmentused in securing my tapping machine to the pipe. Fig. 4, is a detailview of the service-pipe connection and the stem for inserting the same.

Similar letters of reference indicate corresponding parts throughout theentire views.

A represents a water, gas, steam or oil main and B represents a saddlemounted on such main and attached thereto bya jointed strap composed oftwo bolt-like rods 0, which are provided with nuts and threads cut ontheir upper ends, and of lower parts D and E which are pivotallyattached to the lower ends of the rods 0, such parts D and E beingprovided, at their lower ends with a hook and eye respectively for thepurpose as will be shown. The saddle B is provided on each side, withslotted ears F for the purpose of receiving the bars 0.

G, represents a valve or gate-body,-which is inserted in the top of thesaddle B by means of a screw thread, such body being provided with alateral boxing G in whichis arranged a slide gate H having an opening inthe center of the same, for the admission of a screw shaft 1, such shaftI, having collars J for the purpose of maintaining such screw shaft inrigid position horizontally with relation to the body G, and such screwshaft I is provided with an operating hand wheel K.

L,'represents a cap which is screwed to the top of the valve body G,such cap being provided with a stuffing-box M, within which a drillshaft Nis inserted, such shaft N having the lower end'formed into adrill O and having a tap P immediately above such drill O.

idly attached to one side of the saddle B, such standard extending abovethe cap L and having a horizontal arm T pivotally attached to the upperend of the standard S. Such arm is provided with a feed screw Uand handwheel V, the lower end of such screw engaging with the upper end of theshaft N.

A represents a gasket which is inserted between the saddle ]3 and pipe Ato prevent any water from escaping while the pipe is being tapped.

B is a faucet which is attached to the side of the saddle B for thepurpose of ascertaining when the pressure is relieved, after a serviceconnection 0 has been inserted in the drilledpipe. Such connection isprovided with a valve for opening and closing the same.

D represents a stem having a collar E near its lower end and a thread onthe lower end of such rod forthe purpose ofguiding and inserting theservice connection into the hole in the pipe A.

The mode of operating my improved tapping machine is as followsz Thesaddle B is placedin position on the pipe A and the parts D and E'areunhooked, passed under the pipe A and hooked, then the rods 0 are placedin position in the slotted ears F and the nuts are screwed down on therods 0 until, by reason of the gasket A no water, steam, gas or oil canescape. The drill rod N is then placed in position in the cap L and thefollower is screwed down against the rubber packing R thus rendering thesame tight and the cap L is placed in position on the valve body G. Thehorizontal arm T and feed screw U are then swung into position and thehole is drilled and threads cut in the sides of such hole as shown inFig. 2. The feed screw is then backed out sulficiently to disengage therod N when the arm T is swung to one side and the drill rod is thenraised above the valve H and such valve is closed by means of the screwred I which valve prevents the water below the same from escaping. Thecap L is then removed and the follower loosened; then the drill rod N isremoved and the stem D is placed in the cap L and the follower isscrewed against the packing R. The service connection 0 is placed on thelower end of the stem D, such connection 0' having its valve closed, andthe cap L is then placed into position, the gate 11 is then opened andthe connection 0' is pressed downward and screwed into the hole preparedfor the same. The stem is backed out of the connection 0' and the faucetB is opened thus relieving the pressure in the tapping machine, when thesame is removed.

I am well aware that it is old in main tapping devices to provide inconjunction with a saddle having slotted ears, bolts adapted to beseated in the slots of the ears and having adjustable nuts and a chainconnecting the lower ends of the bolts and adapted to rest beneath amain or pipe. I therefore make no claim to such construction, but

What I claim, and desire to secure by Letters Patent, isa In a maintapping machine, the combination with a saddle adapted to rest on a mainand having the slotted ears F; of the bolt-like rods G, adapted to restin the slots of the ears F, and having threads for the engagement ofadjusting nuts, the link E, flexibly connected to one of the rods 0, andhaving an eye at its free end, and the link D, pivotally connected tothe other rod 0, and having a hook at its free end adapted to engage theeye of the link E, substantially as and for the purpose set forth.

In testimony whereof I ailix my signature in presence of two witnesses.

MORGAN CRAWFORD, JR.

Witnesses:

Josnnn l3. WEBsTEn, MOLBRY HAYNES.

